Home / 7,815.50-10,785.66-4,278.72

Finding the Fourth Proportional to 7,815.50, 10,785.66 and 4,278.72

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Solution

The fourth proportional to 7,815.50, 10,785.66 and 4,278.72 is: 5,904.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.50 : 10,785.66 = 4,278.72 : x
  2. Step 2: Convert to fraction form
    7,815.50/10,785.66 = 4,278.72/x
  3. Step 3: Cross multiply
    7,815.50x = 10,785.66 × 4,278.72
  4. Step 4: Simplify right side
    7,815.50x = 46,148,819.16
  5. Step 5: Solve for x
    x = 46,148,819.16/7,815.50
  6. Step 6: Final answer
    x = 5,904.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.